rendered image shows artifact

[LFrank2021]

After installing a new VM with current Icinga2, Icingaweb2, IcingaDB, IcingaDB-redis, Grafana, MariaDB and InfluxDB the preview renders of the performancedata looks 'ugly'.
there seems to be some kind of artifacts showing from the top left to the bottom right.

Current Behavior

The preview image on Icingaweb2 site shows artifacts.

Expected Behavior

The preview render on Icingaweb2 site should not show artifacts.

Your Environment

Icinga Web 2 Version 2.12.1
Git commit cd2daeb2cb8537c633d343a29eb76c54cd2ebbf2
PHP Version 8.1.24
Git commit date 2023-11-15
Loaded Libraries
icinga/icinga-php-library 0.13.1
icinga/icinga-php-thirdparty 0.12.1
Loaded Modules
director 1.11.0
doc 2.12.1
grafana 2.0.3
icingadb 1.1.1
incubator 0.21.0
monitoring 2.12.1

icinga2 --version

icinga2 - The Icinga 2 network monitoring daemon (version: r2.14.2-1)

System information:
Platform: openSUSE Leap
Platform version: 15.5
Kernel: Linux
Kernel version: 5.14.21-150500.55.44-default
Architecture: x86_64

Build information:
Compiler: GNU 7.5.0
Build host: unknown
OpenSSL version: OpenSSL 1.1.1l-fips 24 Aug 2021 SUSE release 150500.17.22.1

Application information:

General paths:
Config directory: /etc/icinga2
Data directory: /var/lib/icinga2
Log directory: /var/log/icinga2
Cache directory: /var/cache/icinga2
Spool directory: /var/spool/icinga2
Run directory: /run/icinga2

Old paths (deprecated):
Installation root: /usr
Sysconf directory: /etc
Run directory (base): /run
Local state directory: /var

Internal paths:
Package data directory: /usr/share/icinga2
State path: /var/lib/icinga2/icinga2.state
Modified attributes path: /var/lib/icinga2/modified-attributes.conf
Objects path: /var/cache/icinga2/icinga2.debug
Vars path: /var/cache/icinga2/icinga2.vars
PID path: /run/icinga2/icinga2.pid

Grafana is integrated by local proxy mode.
I would not be surprised if I made an error here but since the render appears it looks good to me.

Kind regards
Frank

[LFrank2021]

I just had an idea that it might be a problem with grafana-image-renderer 3.9.1 and reverted back to 3.4.2, then tried 3.7.2 and 3.8.4, all versions showed nor artifacts.
Any idea if it is on their side or if it is a combination from both plugins?
opened an issue on their Git-Project grafana/grafana-image-renderer#498